<html><!DOCTYPE html>
<html>
<head>
<script>
    function loadXMLDoc(url)
    {
        var xmlhttp;
        if (window.XMLHttpRequest)
        {// code for IE7+, Firefox, Chrome, Opera, Safari
            xmlhttp=new XMLHttpRequest();
        }
        else
        {// code for IE6, IE5
            xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
        }
        xmlhttp.onreadystatechange=function()
        {
        if (xmlhttp.readyState==4 && xmlhttp.status==200)
            {
                document.getElementById('p1').innerHTML=xmlhttp.getAllResponseHeaders();
            }
        }
        xmlhttp.open("GET",url,true);
        xmlhttp.send();
    }
</script>
</head>
<body>

    <p id="p1">通过ajax请求，从本地文件获取内容</p>
    <button onclick="loadXMLDoc('./ajax_test.txt')">Get header information</button>

</body>
</html>